Error generate rig in (rigify) after removing tongue and bottom teeth bone
Found it!
So, you create &quot;faces.super_face&quot; in rigify buttons tab.
delete all the face bone except the one that you accidentally delete. In my case, those are tongue bones and bottom teeth bone. Then, you parent them back to face bone, reposition them and click &quot;generate rig&quot; in object mode. It successfully generate the rig.
Notes for others, never delete any bones from the face rig. if you don't want to use them just deactivate &quot;deform&quot; in bones properties. *credits goes to R-800 for the info!!
Shout out and thanks to R-800 for helping me!!